Random Cards

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main(void) {
  int i, cards[50];
  srand((unsigned) time(NULL));
  for (i = 0; i < 50; i++) cards[i] = i + 1;
  for (i = 49; i >= 1; i--) {
    int t, j = (int) ((rand() / ((double) RAND_MAX + 1.0)) * i);
    t = cards[i]; cards[i] = cards[j]; cards[j] = t;
  }
  for (i = 0; i < 50; i += 5) printf("%d ", cards[i]); puts("");
  return 0;
}